#! /usr/bin/python -E
# Authors: Simo Sorce <ssorce@redhat.com>
#          Karl MacMillan <kmacmillan@mentalrootkit.com>
#
# Copyright (C) 2007  Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; version 2 only
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#

try:
    import sys

    import os
    import krbV
    import socket
    import logging
    from optparse import OptionParser
    import ipaclient.ipadiscovery
    import ipaclient.ipachangeconf
    import ipaclient.ntpconf
    from ipa.ipautil import run, user_input
    from ipa import sysrestore
    from ipa import version
except ImportError:
    print >> sys.stderr, """\
There was a problem importing one of the required Python modules. The
error was:

    %s
""" % sys.exc_value
    sys.exit(1)


def parse_options():
    parser = OptionParser(version=version.VERSION)
    parser.add_option("--domain", dest="domain", help="domain name")
    parser.add_option("--server", dest="server", help="IPA server")
    parser.add_option("--realm", dest="realm_name", help="realm name")
    parser.add_option("-f", "--force", dest="force", action="store_true",
                      default=False, help="force setting of ldap/kerberos conf")
    parser.add_option("-d", "--debug", dest="debug", action="store_true",
                      default=False, help="print debugging information")
    parser.add_option("-U", "--unattended", dest="unattended",
                      action="store_true",
                      help="unattended installation never prompts the user")
    parser.add_option("--ntp-server", dest="ntp_server", help="ntp server to use")
    parser.add_option("-N", "--no-ntp", action="store_false",
                      help="do not configure ntp", default=True, dest="conf_ntp")
    parser.add_option("--on-master", dest="on_master", action="store_true",
                      help="use this option when run on a master", default=False)
    parser.add_option("", "--uninstall", dest="uninstall", action="store_true",
                      default=False, help="uninstall an existing installation")

    options, args = parser.parse_args()

    if (options.server and not options.domain):
        parser.error("--server cannot be used without providing --domain")

    return options

def logging_setup(options):
    # Always log everything (i.e., DEBUG) to the log
    # file.

    log_file = "/var/log/ipaclient-install.log"
    if options.uninstall:
        log_file = "/var/log/ipaclient-uninstall.log"

    old_umask = os.umask(077)
    logging.basicConfig(level=logging.DEBUG,
                        format='%(asctime)s %(levelname)s %(message)s',
                        filename=log_file,
                        filemode='w')
    os.umask(old_umask)

    console = logging.StreamHandler()
    # If the debug option is set, also log debug messages to the console
    if options.debug:
        console.setLevel(logging.DEBUG)
    else:
        # Otherwise, log critical and error messages
        console.setLevel(logging.ERROR)
    formatter = logging.Formatter('%(name)-12s: %(levelname)-8s %(message)s')
    console.setFormatter(formatter)
    logging.getLogger('').addHandler(console)

def uninstall(options):

    print "Restoring client configuration files"
    fstore.restore_all_files()

    print "Disabling client Kerberos and Ldap configurations"
    try:
        run(["/usr/sbin/authconfig", "--disableldap", "--disablekrb5", "--update"])
    except Exception, e:
        print "Failed to remove krb5/ldap configuration. " +str(e)
        sys.exit(1)

    try:
        run(["/sbin/service", "nscd", "restart"])
    except:
        print "Failed to restart start the NSCD daemon"

    if not options.unattended:
        print "The original nsswitch.conf configuration has been restored."
        print "You may need to restart services or reboot the machine."
        if not options.on_master:
            if user_input("Do you want to reboot the machine?", False):
                try:
                    run(["/usr/bin/reboot"])
                except Exception, e:
                    print "Reboot command failed to exceute. " + str(e)
                    sys.exit(1)

def main():
    options = parse_options()
    logging_setup(options)
    dnsok = True

    global fstore
    fstore = sysrestore.FileStore('/var/lib/ipa-client/sysrestore')

    if options.uninstall:
        return uninstall(options)

    cli_domain = None
    cli_server = None
    cli_realm = None
    cli_basedn = None

    # Create the discovery instance
    ds = ipaclient.ipadiscovery.IPADiscovery()

    ret = ds.search(domain=options.domain, server=options.server)
    if ret == -10:
        print "Can't get the fully qualified name of this host"
        print "Please check that the client is properly configured"
        return ret
    if ret == -1 or not ds.getDomainName():
        logging.debug("Domain not found")
        if options.domain:
            cli_domain = options.domain
        elif options.unattended:
            return ret
        else:
            print "DNS discovery failed to determine your DNS domain"
            cli_domain = user_input("Please provide the domain name of your IPA server (ex: example.com)", allow_empty = False)
        ret = ds.search(domain=cli_domain, server=options.server)
    if not cli_domain:
        if ds.getDomainName():
            cli_domain = ds.getDomainName()

    if ret == -2 or not ds.getServerName():
        dnsok = False
        logging.debug("IPA Server not found")
        if options.server:
            cli_server = options.server
        elif options.unattended:
            return ret
        else:
            print "DNS discovery failed to find the IPA Server"
            cli_server = user_input("Please provide your IPA server name (ex: ipa.example.com)", allow_empty = False)
        ret = ds.search(domain=cli_domain, server=cli_server)
    if not cli_server:
        if ds.getServerName():
            cli_server = ds.getServerName()

    if ret != 0:
        print "Failed to verify that "+cli_server+" is an IPA Server."
        print "This may mean that the remote server is not up or is not reachable"
        print "due to network or firewall settings."
        return ret

    if dnsok:
        print "Discovery was successful!"
    elif not options.unattended:
        print "\nThe failure to use DNS to find your IPA server indicates that your"
        print "resolv.conf file is not properly configured.\n"
        print "Autodiscovery of servers for failover cannot work with this configuration.\n"
        print "If you proceed with the installation, services will be configured to always"
        print "access the discovered server for all operation and will not fail over to"
        print "other servers in case of failure.\n"
        if not user_input("Do you want to proceed and configure the system with fixed values with no DNS discovery?", False):
            return ret

    if options.realm_name and options.realm_name != ds.getRealmName():
        if not options.unattended:
            print "ERROR: The provided realm name: ["+options.realm_name+"] does not match with the discovered one: ["+ds.getRealmName()+"]\n"
        return -3

    cli_realm = ds.getRealmName()
    cli_basedn = ds.getBaseDN()

    print "Realm: "+cli_realm
    print "DNS Domain: "+cli_domain
    print "IPA Server: "+cli_server
    print "BaseDN: "+cli_basedn

    print "\n"
    if not options.unattended and not user_input("Continue to configure the system with these values?", False):
        return 1

    # Configure ipa.conf
    if not options.on_master:
        ipaconf = ipaclient.ipachangeconf.IPAChangeConf("IPA Installer")
        ipaconf.setOptionAssignment(" = ")
        ipaconf.setSectionNameDelimiters(("[","]"))

        opts = [{'name':'comment', 'type':'comment', 'value':'File modified by ipa-client-install'},
                {'name':'empty', 'type':'empty'}]

        #[defaults]
        defopts = [{'name':'server', 'type':'option', 'value':cli_server},
                   {'name':'realm', 'type':'option', 'value':cli_realm},
                   {'name':'domain', 'type':'option', 'value':cli_domain}]

        opts.append({'name':'defaults', 'type':'section', 'value':defopts})
        opts.append({'name':'empty', 'type':'empty'})

        fstore.backup_file("/etc/ipa/ipa.conf")
        ipaconf.newConf("/etc/ipa/ipa.conf", opts)
        print "Created /etc/ipa/ipa.conf"


    # Configure ldap.conf
    ldapconf = ipaclient.ipachangeconf.IPAChangeConf("IPA Installer")
    ldapconf.setOptionAssignment(" ")

    opts = [{'name':'comment', 'type':'comment', 'value':'File modified by ipa-client-install'},
            {'name':'empty', 'type':'empty'},
            {'name':'ldap_version', 'type':'option', 'value':'3'},
            {'name':'base', 'type':'option', 'value':cli_basedn},
            {'name':'empty', 'type':'empty'},
            {'name':'nss_base_passwd', 'type':'option', 'value':'cn=users,cn=accounts,'+cli_basedn+'?sub'},
            {'name':'nss_base_group', 'type':'option', 'value':'cn=groups,cn=accounts,'+cli_basedn+'?sub'},
            {'name':'nss_schema', 'type':'option', 'value':'rfc2307bis'},
            {'name':'nss_map_attribute', 'type':'option', 'value':'uniqueMember member'},
            {'name':'nss_initgroups_ignoreusers', 'type':'option', 'value':'root,dirsrv'},
            {'name':'empty', 'type':'empty'},
            {'name':'nss_reconnect_maxsleeptime', 'type':'option', 'value':'8'},
            {'name':'nss_reconnect_sleeptime', 'type':'option', 'value':'1'},
            {'name':'bind_timelimit', 'type':'option', 'value':'5'},
            {'name':'timelimit', 'type':'option', 'value':'15'},
            {'name':'empty', 'type':'empty'}]
    if not dnsok or options.force or options.on_master:
        if options.on_master:
            opts.append({'name':'uri', 'type':'option', 'value':'ldap://localhost'})
        else:
            opts.append({'name':'uri', 'type':'option', 'value':'ldap://'+cli_server})
    else:
        opts.append({'name':'nss_srv_domain', 'type':'option', 'value':cli_domain})

    opts.append({'name':'empty', 'type':'empty'})
    try:
        fstore.backup_file("/etc/ldap.conf")
        ldapconf.newConf("/etc/ldap.conf", opts)
        print "Configured /etc/ldap.conf"
    except Exception, e:
        print "Creation of /etc/ldap.conf: " + str(e)
        return 1

    #If on master assume kerberos is already configured properly.
    if not options.on_master:

        #Configure krb5.conf
        krbconf = ipaclient.ipachangeconf.IPAChangeConf("IPA Installer")
        krbconf.setOptionAssignment(" = ")
        krbconf.setSectionNameDelimiters(("[","]"))
        krbconf.setSubSectionDelimiters(("{","}"))
        krbconf.setIndent(("","  ","    "))

        opts = [{'name':'comment', 'type':'comment', 'value':'File modified by ipa-client-install'},
                {'name':'empty', 'type':'empty'}]

        #[libdefaults]
        libopts = [{'name':'default_realm', 'type':'option', 'value':cli_realm}]
        if not dnsok or options.force:
            libopts.append({'name':'dns_lookup_realm', 'type':'option', 'value':'false'})
            libopts.append({'name':'dns_lookup_kdc', 'type':'option', 'value':'false'})
        else:
            libopts.append({'name':'dns_lookup_realm', 'type':'option', 'value':'true'})
            libopts.append({'name':'dns_lookup_kdc', 'type':'option', 'value':'true'})
        libopts.append({'name':'ticket_lifetime', 'type':'option', 'value':'24h'})
        libopts.append({'name':'forwardable', 'type':'option', 'value':'yes'})

        opts.append({'name':'libdefaults', 'type':'section', 'value':libopts})
        opts.append({'name':'empty', 'type':'empty'})

	#the following are necessary only if DNS discovery does not work
        if not dnsok or options.force:
            #[realms]
            kropts =[{'name':'kdc', 'type':'option', 'value':cli_server+':88'},
                     {'name':'admin_server', 'type':'option', 'value':cli_server+':749'},
                     {'name':'default_domain', 'type':'option', 'value':cli_domain}]
            ropts = [{'name':cli_realm, 'type':'subsection', 'value':kropts}]
            opts.append({'name':'realms', 'type':'section', 'value':ropts})
            opts.append({'name':'empty', 'type':'empty'})

        #[domain_realm]
        dropts = [{'name':'.'+cli_domain, 'type':'option', 'value':cli_realm},
                  {'name':cli_domain, 'type':'option', 'value':cli_realm}]
        opts.append({'name':'domain_realm', 'type':'section', 'value':dropts})
        opts.append({'name':'empty', 'type':'empty'})

        #[appdefaults]
        pamopts = [{'name':'debug', 'type':'option', 'value':'false'},
                   {'name':'ticket_lifetime', 'type':'option', 'value':'36000'},
                   {'name':'renew_lifetime', 'type':'option', 'value':'36000'},
                   {'name':'forwardable', 'type':'option', 'value':'true'},
                   {'name':'krb4_convert', 'type':'option', 'value':'false'}]
        appopts = [{'name':'pam', 'type':'subsection', 'value':pamopts}]
        opts.append({'name':'appdefaults', 'type':'section', 'value':appopts})

        fstore.backup_file("/etc/krb5.conf")
        krbconf.newConf("/etc/krb5.conf", opts);
        print "Configured /etc/krb5.conf for IPA realm " + cli_realm

    #Modify nsswitch to add nss_ldap
    run(["/usr/sbin/authconfig", "--enableldap", "--update"])
    print "LDAP enabled"

    #Check nss_ldap is working properly
    if not options.on_master:
        try:
            run(["getent", "passwd", "admin"])
        except Exception, e:
            print "nss_ldap is not able to use DNS discovery!"
            print "Changing configuration to use hardcoded server name: " +cli_server

            opts = [{'name':'uri', 'type':'option', 'action':'set', 'value':'ldap://'+cli_server},
                    {'name':'empty', 'type':'empty'}]
            try:
                ldapconf.changeConf("/etc/ldap.conf", opts)
            except Exception, e:
                print "Adding hardcoded server name to /etc/ldap.conf failed: " + str(e)
                return 1

    #Modify pam to add pam_krb5
    run(["/usr/sbin/authconfig", "--enablekrb5", "--update"])
    print "Kerberos 5 enabled"

    if options.conf_ntp and not options.on_master:
        if options.ntp_server:
            ntp_server = options.ntp_server
        else:
            ntp_server = cli_server
        ipaclient.ntpconf.config_ntp(ntp_server, fstore)
        print "NTP enabled"

    #Activate Name Server Caching Daemon
    try:
        run(["/sbin/service", "nscd", "restart"])
    except:
        print "Failed to start the NSCD daemon"
        print "Caching of users/groups will not be available"
        pass

    try:
        run(["/sbin/chkconfig", "nscd", "on"])
    except:
        print "Failed to configure automatic startup of the NSCD daemon"
        print "Caching of users/groups will not be available after reboot"
        pass

    print "Client configuration complete."

    return 0

try:
    if __name__ == "__main__":
        sys.exit(main())
except SystemExit, e:
    sys.exit(e)
except KeyboardInterrupt:
    sys.exit(1)
